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SIPLACE 80S/F/G User’s Manual 7 Vision Systems Edition 07/97 from S oftware Version SR.010.xx 7.7 Guidelines for Describing P ackage Forms Line engi neer 7 - 105 Flat illumination level The fla t illumina tion level is u…

7 Vision Systems SIPLACE 80S/F/G User’s Manual

7.7 Guidelines for Describing Package Forms Edition 07/97 from Software Version SR.010.xx

7 - 104 Line engineer

Fig 7.7.6 Typical measuring modes with standard components

7.7.6 Setting the Components Illumination at the Revolver Head Cam-

era

7.7.6.1 General Information on Illumination Methods

The idea of illumination setting is to obtain an image of the leads of a component which is as high-contrast as

possible. At the same time it is also important to suppress representation of the body of the component.

These instructions are intended to help you find the best possible illumination parameters. This, however,

does not imply that you rigidly comply with the values specified in these instructions. The way you should pro-

ceed is first to follow these instructions and then to adjust the parameters yourself where necessary. It may

well be that you come across one or other component the leads of which are better illuminated using values

different to the ones suggested in these instructions.

The illumination system comprises two different illumination levels. The intensities can be programmed indi-

vidually. By using the individual illumination levels one at a time or in combination with one another you can

adapt the illumination to suit a wide range of components.

Chip

Melf

BGA

Flip chip

Tantal

capacitor

0402,

0603, etc.

General

SIZE

high

resolution

Small

BGA

SIZE

LEAD

outer tip

SIZE

LEAD

outer tip

SIZE (depends

on the comp.

size)

SIZE

CORNER

outer tip

LEAD

outer tip

SOJ,

PLCC

SIZE

CORNER

Lead center

LEAD

Lead center

Large

CORNER

outer tip

LEAD

outer tip

ROW

outer tip

SO,

QFP

PLCC

CORNER

Lead center

LEAD

Lead center

ROW

Lead center

GRID

BALL

SO, SOT

QFP

Flip Chip

SIZE (depends

on the comp.

size)

GRID

BALL

SIPLACE 80S/F/G User’s Manual 7 Vision Systems

Edition 07/97 from Software Version SR.010.xx 7.7 Guidelines for Describing Package Forms

Line engineer 7 - 105

Flat illumination level

The flat illumination level is used for illuminating J-lead components (PLCC), Melfs and components with con-

vex-type leads. It tends to emphasize body and lead edges and suppresses reflective component surfaces.

Steep illumination level

The main application for the steep illumination level is for reflective leads, ceramic components and bright

component bodies. It is less suitable for reflective component bodies.

NOTE

For the best illumination of most components a combination of these two lighting levels is required.

Using one illumination level will only be successful in exceptional cases.

7.7.6.2 Pseudo-Color Display

The pseudo-color display is used to enable an informative and objective evaluation of the illumination to be

made. Each brightness value is represented by a different color.

Revolver head conversion table for the pseudo-color display

For measurement a contrast of at least 4 color steps is required between the leads and the body. Under the

GF manipulator's Illumination menu, components are displayed in pseudo-color on the station computer mon-

itor.

Color step Brightness

white

light

yellow

orange

red

brown

green

light blue

blue

violet

black

dark

7 Vision Systems SIPLACE 80S/F/G User’s Manual

7.7 Guidelines for Describing Package Forms Edition 07/97 from Software Version SR.010.xx

7 - 106 Line engineer

7.7.6.3 Settings for Illuminating Standard Components

The standard range of components includes chips (0402 to 2220), tantalum capacitors, Melf components,

PLCCs, QFPs, SOs, SOJs, TSOPs, ICs, and power components.

For the components which are listed below the GF interpreter in the station computer uses the default illumi-

nation parameters listed in Fig. 7.7.7:

–

Chips (0402 to 2220)

–

Tantalum capacitors (component bodies, non-reflective)

–

Melf

–

PLCC, QFP, SO, SOJ, TSOP, ICs

As a rule you will not need to change the illumination parameters for the standard components. For all other

components you will need to determine the illumination values and test them (see Section 7.7.6.4,

Page 7 - 106).

Fig. 7.7.7 Illumination parameters for standard components at the revolver head camera 19 x 25

7.7.6.4 Settings for Illuminating Other Components

Fig. 7.7.8 presents a list of the illumination settings for other components.

Diagram for adjusting the illumination of standard components

Chip

Power IC

Melf

Tantalum

capacitor

0805 and

larger

0402,

0603

General

flat: 110

steep: 110

flat: 200

steep: 50

flat: 225

steep: 90

flat: 110

steep: 70

Gullwing

SO, SOT,

TSOP

QFP,

flat: 120

steep: 180

flat: 120

steep: 180

J-Lead

PLCC

flat: 140

steep: 90

Illumination

level

Brightness